[DRBD-user] DRBD or not DRBD ?

Whit Blauvelt whit.drbd at transpect.com
Tue Apr 26 19:05:57 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Sun, Apr 24, 2011 at 10:21:44PM -0400, Digimer wrote:

> Matching LVs are not the same LVs. The LV with your VM is a single item,
> and having it treated as such, which you get with clvmd, will ensure
> that it's not startable on either node at the same time.

Okay, that could be valuable. Thanks. How does that layer with DRBD? Is
there a path from a currently-configured and running lvm system to clvmizing
it? Red Hat's documentation here:


is only a rough sketch at best. For all the effort going into various
cluster and cloud scenarios, it amazes me how little is getting written up

> RHCS's rgmanager is much simpler than Pacemaker, and is well tested and
> already exists. Writing your own scripts is, I'd argue, a fools errand. :)

Ah, but running rgmanager on Ubuntu would be even more foolish. My
preference for Ubuntu as host is off topic, but it's a strong one. The
configuration files alone needed for all the elements of a good Pacemaker
install might require more lines of code than a custom script for a
well-defined, limited situation like mine. And the script, I'd understand.
The configuration file approach gets into trusting voodoo. Not that much of
sysadmin work doesn't consist in trusting voodoo....

> I must admit, you lost me somewhat in your reference to emailing people. :)

Any notable systems events around here result in notices, whether through
Nagios or independently. 

Best, and thanks again,

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